Adopt Swift 3 syntax

Author: cyhsutw

Examples/Messenger-Swift/AppDelegate.swift

@@ -14,8 +14,8 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
 
     var window: UIWindow?
 
-    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
-        window?.backgroundColor = UIColor.whiteColor()
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+        window?.backgroundColor = UIColor.white
         return true
     }
 }